Revert "Support flatpak build system"

This reverts commit 904dc2d.

.gitignore

@@ -1,11 +1,6 @@
 .env
 .directory
 
-# Flatpak
-.flatpak-builder/
-.flatpak/
-deepqt.flatpak
-
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

Makefile

@@ -1,15 +1,7 @@
 # define variables
-PROJECT = deepqt
 PYTHON = python
 BUILD_DIR = dist/
 BUILD_CACHE = deepqt.egg-info/
-FLATPAK_PROJECT = com.voxel.deepqt
-FLATPAK_SOURCE_DIR = .flatpak/flatpak_sources
-FLATPAK_BASE_DIR = .flatpak
-FLATPAK_BUILD_DIR = .flatpak/build-dir
-FLATPAK_REPO_DIR = .flatpak/repo
-FLATPAK_PYTHON_PACKAGE_DIR = $(FLATPAK_SOURCE_DIR)/python-packages
-
 
 # default target
 fresh-install: clean build install
@@ -30,28 +22,5 @@ clean:
 release:
 	twine upload $(BUILD_DIR)*
 
-# flatpak targets
-prepare-flatpak: clean-flatpak
-	mkdir -p $(FLATPAK_BUILD_DIR) $(FLATPAK_REPO_DIR)
-	mkdir -p $(FLATPAK_SOURCE_DIR)
-	pip download -r requirements.txt --dest $(FLATPAK_PYTHON_PACKAGE_DIR)
-    # Also build the current package to the dependencies folder.
-	$(PYTHON) -m build --outdir $(FLATPAK_PYTHON_PACKAGE_DIR)
-	# Include the desktop file and the icon in the flatpak.
-	cp ./media/deepqt.png $(FLATPAK_SOURCE_DIR)/deepqt.png
-	cp ./DeepQt-flatpak.desktop $(FLATPAK_SOURCE_DIR)/DeepQt.desktop
-
-build-flatpak: prepare-flatpak
-	flatpak-builder --repo=$(FLATPAK_REPO_DIR) --force-clean $(FLATPAK_BUILD_DIR) $(FLATPAK_PROJECT).yaml
-	@echo 'Building flatpak bundle, this may take a few minutes...'
-	flatpak build-bundle $(FLATPAK_REPO_DIR) $(PROJECT).flatpak $(FLATPAK_PROJECT)
-	rm -rf $(FLATPAK_BUILD_DIR)
-
-install-flatpak: build-flatpak
-	flatpak install --user --bundle $(PROJECT).flatpak
-	flatpak run $(FLATPAK_PROJECT)
-
-clean-flatpak:
-	rm -rf .flatpak
 
-.PHONY: clean build install fresh-install release prepare-flatpak build-flatpak clean-flatpak
+.PHONY: clean build install fresh-install release